Erection While Being Penetrated

I usually am half erect when I start to slide my dildo in my ass, by the time I open up and accept it all I am rock hard. Then sliding it in and out rubbing against my prostate it feels like the head of my cock is going to explode, so I keep working until my prostate milk starts oozing out of my head, I like the way it tastes, its a little different than seamen. Starts out kind of thin but as I keep going it gets thicker and looks like cum.
So I keep going to try and get a prostate orgasm but once the milk stops flowing my prostate becomes less sensitive and I cannot achieve it so I jerk off with my dildo in my ass which gives me a leg shaking orgasm and produces a large amount of cum.

 

I got an erection when my female kink buddy confessed she wanted to watch me being fucked by another guy. I have never engaged in this before but the idea obviously turns me on ( as long as a female watches)

 

I was fucked by a guy for the first time quite recently. It was in front of two women. I have a rampant sph fetish and the experience was so arousing that I didnt just get hard I came while he was doing me.

 

For me its just the position. If I am bent overgetting it doggy I can get a chub but that is from the swinging motion. On my back I cannot get hard but if the top knows how to fuck I will end up cumming on my stomach or at least leaking puddles of precum. If I ride cowboy facing him I can stay rock hard and cum all over his chest

 

I recently was involved with two couples (I was kind of a plus one) One couple was an ex girlfriend and her boyfriend and the other was a guy from my social circle and his female escort. He fucked me and I got an erection due to my sph fetish. I have a tiny penis and it was very arousing that the two women saw me being dominated and out manned in this manner. He pushed his much bigger cock up against my little dick and his escort wanked us with our cocks pressed together. I came very hard then he shot his load all over my baby dick and my stomach.

 

Before they made watching any porn on line into a Big Brother legal registry thing I visited a particular video numerous times. It features a guy with a very tiny penis being fucked by a guy with a big cock. The little penis doesn't get an erection but his little dick jiggles about and is about the same size as mine. The first time I was fucked by another guy it was in front of two women. Because of my SPH fetish the arousal factor of them seeing my tiny cock jiggling about as I submit to the 'superior' man ensured I got an erection