What's wrong with me?

Solo Touch is my main source of fun. Oh, I know there's porn, but 99% of it seems.....well...so staged it's totally unbelievable. And yes, some of the stories here are a bit hard to swallow, but there are many that seem credible.  What is interesting me is my reading material seems to go by themes. For example, up until last week, I read a lot of solo men jacking off.....before that it was how women got themselves off. But lately, I find myself absorbed with brother/sister.  I can imagine that siblings suddenly become aware of each other as sexual beings, and that there is curiosity.  Up until recently, if you had asked me if my sister and I would ever do anything sexual together I would have said "No way on earth."  But a phone call with a friend gave it a different slant. He has an older sister and (obviously) she went through puberty before he did. As this was happening (in his own words) "...suddenly it was like my sister was in a special club to which I was banned. My parents seemed to elevate her into a different status in the family. I wasn't allowed to ask questions...I had to give her far more leeway than I was allowed....and it made me really, REALLY determined to find out what the mystery was."  No, they didn't have sex, but he did admit to me that he became a panty sniffer. "I just discovered that she had this really intoxicating scent."  So, I found myself reading more and more brother/sister stories....and getting really turned on by them. I don't have a brother, but my imagination does!  Sometimes, especially since lockdown, I admit I have fantasised about my dad fucking me. Oh, it's only a very rare event, and as I've told you, I never pre program my mind....I just let it float until it locks onto something sexual. In the cold light of day, it's a disgusting thought, but sometimes, when I need something to really do the trick......well..... My favourite fantasy about my (non-existant) brother goes like this. He is younger than me, and typically, what I imagine a pain in the ass kid brother to be like. Immature, crass, boring. One day, I'm home unexpectedly early and I find the little shit in my rooom. I'm furious at this intrusion and I let go at him. In mid flow, I notice he is hiding something behind his back. He won't tell me what it is, or show me either. I get physical with him and start shoving him around. Then I see what he is hiding....my (used) underwear. I also notice the bulge in his pants.  Here, the fantasy takes one of two paths. Either I make him jack off in front of me with threats that I will tell on him if he doesn't, or I soften....I become sorry for him because (like my friend) I realise how isolated the family have made him.  I sit him down on my bed and ask him why he likes my underwear so much. He tells me because the scent really drives him crazy, and makes him hella horny.  I slip my underwear off and part my legs to show him. Then I ask him to smell me. He does, and comments that I smell different "for real" as he puts it. Then I make him get his dick out. It's thin but quite long. I ask him to put it inside me and there we are, fucking. My brother is screwing me. My brother...... He doesn't last long and tells me he is nearly there. I tell him to just let it happen. I feel him cum inside me. The thought of him spurting in me sends me over.  As the lockdown has gone on, Ive found my sexual fantasies getting more and more intense. Has anyone else found this?  Anyone else in my situation....(in a house with only a same sex sibling and parents....or maybe different sex sibling(s) and parents. Has your sex life ground to a halt?