At Home by Someone Else

When I was 20 I lived for more than 2 years with a family that for the time being 'adopted' me as their son with the consent from my parents that thought that it might be a nice experience for me to live with another family for a while; we would still live only 10 miles from each other, and both families visited each other a lot; both families are until this day befriended with each other.

After I lived with the family for a couple of months I started to notice that 2 of the 3 children of the family (boy 18 + girl 19) sometimes didn't want to go with the rest of us to a neighboring park. Having had a lot of puberty sex experience in my teens I immediately smelled "a rat" and got excited about how far they would actually go when given the chance, but the problem was that they didn't want to be discovered; nor did I.

Some months later I lay in bed at night when I heard a pretty loud "bang" on the wall; it came from the bedroom of the girl and apparently was a sign for the boy to come to her. With the very thin walls separating the two bedrooms (the boys slept in one room, she in the other). I knew I would be able to hear it all as she masturbated almost every night and my bed was placed direct to her wall so every night I could hear the sloshing, moaning sounds of masturbation that she made on an almost daily basis.

As he made his move, he went to the toilet and then instead of going back to his bed he entered her room. Before I heard the "bang" she had already masturbated for quite some time, so she was all oiled up. She whispered to him that they couldn't do it on the bed as it would make too much noise. She said she would put some blankets on the floor. As she got out of bed it made quite a noise; she was right on that one all right. The boy, 18 at that time, is until today a slim 5ft man and inherited his fathers' muscular build, he was the type of guy that had somewhat of a sport-look without really working for it.

Slowly I removed my underwear not to make a sound; my dick, according all of the women and men that I've had sex with, is a fairly large one; 7.5 inch. I masturbate from age 9 almost 2-3 times a day and I can cum more and often when I have sex, but without making a women pregnant as the seed apparently is too weak. My wife is very happy with that fact and says that if I didn't got married with her I would've probably ended up as a porn star.

Anyhow; as I wondered how far those 2 would actually go my thoughts wandered off about her body. She is somewhat of a semi-blonde, having small nippled B-cup breasts and is sturdy build. Not fat, but she often is described being a tomboy; and that night she proved it! At first I heard her laying down on the blanket, and her brother immediately climbed on top of her. For a couple of seconds I heard nothing, but then I heard to my amazement something that I had never would have even thought of in all of my years of adolescent, pubertal sex. I heard the boy count: 1.2.3.4.5 and so on. Suddenly I realized and could picture what was happening not more than 3 feet away from my bed; the boy was having regular sex with his sister and was counting the amount of times he entered into her, in order to keep his young dick from spurting cum into his sisters' vulva, preventing a pregnancy, and possibly set some new record with the amount of times he could move his dick in and out of her before he needed to cum! I could hear her moaning with pleasure asking him to continue.

Beyond the count of 20 he got careless as I could clearly hear the sucking sound of his dick entering and leaving the wet cunt of her sister. Somewhere around the count of 35 he apparently couldn't bare it any longer, as he stopped counting and came outside her vagina. I heard how he groaned softly and then cleaned up the semen from her body. As he sprayed his semen over her I stoked my dick quickly; I was very excited and came as though it was I that was having sex with her, spraying my cum in a pretty much uncontrolled fashion. Whilst I was doing that he licked her to an orgasm. As she started to moan and begged him to continue to lick her; possibly whilst fingering her vagina that by now had developed a very desperate urge to cum. After they cleaned up their act he quickly moved out of her room, and went back to his bed.

The following months I followed their behavior and when all were outdoors except the 2 'lovers' and I, they once again could not control their urges and moved upstairs (2nd floor) as they thought that I was busy downstairs in the basement. I was, but as I became sensitive for their 'hobby' I noticed them going upstairs and I opened the door of the basement and slowly, silently climbed the stairs to the first floor. When I listened through the stairwell from the first to the second floor I could hear them being busy once again; but I didn't want to go to the second floor as those stairs were made of wood, thus ‘disturbing' their precious moments. From a distance I could hear her moan, but no counting so apparently they were having a 'quickie' masturbating each other.

It is now years later, and both of them are now married. She with some fat guy and has two kids, he with very a bossy wife and three kids. But knowing that they did this on a regular basis for years I suspect that they are still making out as it's not suspicious for a brother to hang out with his sister like they still do on a regular basis; they live a mere 15 minutes drive from each other. Even though this was not the greatest masturbation event that I've had in my life, it is definitely the most voyeuristic masturbation that I've had until this day.