Watching Our House Guest

A friend of my husband and I came to visit us in our house in Spain, where we moved to earlier this year. Sam had flown over the evening before, and we'd had a few drinks before heading to bed. We have a big place here in Spain and the following morning, after my husband had gone into work, I thought I'd get up and make some breakfast for our houseguest. I slipped on my robe and walked down the hallway to the guest room where Sam was staying. As I said, the house is quite big and spread out, and the hallway sort of bends round and opens up into the guest room at the other end of the house. There are double sliding doors which can close off the bedroom, but I'd left them open yesterday and obviously last night in the dark Sam hadn't worked out how to close them, or hadn't realised the doors were there as the angles of the hall make the room feel quite secluded anyway. Not wanting to startle or wake him up, I tip toed to the corner of the wall and poked my head round. It was me who got the surprise, as he was lying naked on the bed, eyes closed and very gently masturbating. He looked so cute lying there, pleasuring himself with a relaxed and content look on his face as he rubbed his erect penis slowly. I'd always fancied him, ever since we first met and have often masturbated thinking about what he would look like naked or what it would be like to be together, so this was amazing to see after all these years. I knew if he opened his eyes he might see me, as the bed was facing my direction, but I couldn't look away, and I have to admit, I slipped my hand under my robe and felt how wet I had become from watching him, and gently rubbed myself between my legs as I watched him do the same. It was so arousing looking at him, he has a nice body, slim but fairly fit.  After a few minutes, he began to breathe more deeply and it became obvious he was approaching an orgasm. I'm really lucky, I can come quite quickly and as I masturbate often, have good contol over when it happens, so I quickened my pace and let myself come, biting my lip to stop myself making any noise.  Just seconds afterwards, Sam had his orgasm, and I could see why he was so in need of one as he ejaculated several shoots onto his tummy. I pulled back slightly, worried he'd open his eyes now he'd finished but could still see him breathing deeply, lying back on his bed. With that I tiptoed back the way I'd came and went back to the kitchen, totally aroused and turned on by what I'd just seen.