Fucking The Brain-damaged Neighbor

A couple years ago I moved into a new apartment building and tried to meet a few of the neighbors. One lady on the floor beneath me seemed very friendly, but had some odd behaviors, and I soon learned that Linda was brain-damaged and had severe epilepsy. Relatives took turns staying with her in the evenings and overnight to make sure she was ok. But she seemed very eager to talk so when I ran into her in the hall or laundry room I would chat with her, and occasionally follow her back to her apartment to continue talking. She was very open about her difficulties, and how she rarely met people. She wasn't bad looking, though had a pudgy stomach, and often didn't look at people directly. She had been married but now divorced, though I didn't learn much about the circumstances there. Insisting that epileptics could function much like other people in sexual relationships, i joked "but probably not give blowjobs safely" (due to the possibility of amputating the penis in a seizure). She didn't respond directly to that, but kept talking to me about fairly intimate matters. I asked her if she liked sex and she said she did, but as usual said everything without any passion or expression. I asked if she would want to have sex with me, and she said she might.

On one visit to her apartment, I offered to rub her back and she was happy to accept. She enjoyed that and also let me fondle and kiss her breasts this time. Touching her turned me on and I asked if I could ejaculate on her. She denied me her face but said I could use her chest, so I jacked off on her tits while she watched completely impassively, then I grabbed a shirt from a pile of dirty laundry to wipe her up.

Another time she was outside with her 12-year old niece Darla, who was staying over that night. I came back in with them and again offered to rub her back in her bedroom while Darla watched TV. I soon had her shirt and bra off to rub her skin better, and asked to do her hips so she took off everything else as well. Rubbing her naked back while sitting on the bulge of her ass was pretty exciting again so I slipped my hard cock out of the side of my shorts and greased it up while sliding back and parting her legs a bit. She had no reaction as I gradually thrust into her hot pussy. This was a bit risky as the door was not completely shut, but I simply trusted that we were being quiet and I would hear Darla if she got up. I had fun fucking her for several minutes while grabbing and squeezing her ass cheeks, but then heard Darla get up so I just leaned further over and resumed the backrub, while staying inserted into Linda and making just tiny thrusts to keep going. The toilet down the hall flushed a few minutes later, then Darla simply walked into the bedroom and started asking Linda about something. She didn't seem to think it odd that Linda was naked, and Linda replied as if nothing unusual was going on. Well, I couldn't be as nonchalant as that and one of my pleasure thrusts must have given me away, as Darla looked closer at what I was doing and smiled. I gave up the pretense of just doing a backrub, and while Darla backed up and watched from the hallway I thrust several more times and ejaculated inside of Linda. I checked to make sure I wasn't watched anymore before pulling out. I took a few minutes to get dressed and found Linda had already gone to sleep, so I quietly left and talked to Darla for a few minutes, just to assure her I was doing what Linda wanted, which Darla seemed to understand. That was my last time, as the next couple times I saw Linda a 20-year man was staying with her, who I feared would be less understanding. Linda never pursued me or indicated that she missed me. Doubtless I was taking advantage of her, but OTOH how else was she going to get any sex in her condition?