A quickish fuck while River does herself

I undress River.  Panties removed at her request.  Kissing.  Me on top rubbing one up.  Underwear off.  River is rubbing her clit. It goes in and I try to stay out of the way.  I want to feel her orgasm from the inside.  Magnetism, flying v.  "I'm going to come."  "You can do that."  Jackknife, a long one for me, in to the cervix, decent post-orgasm stiffness for a while then out it comes.  River reaches to feel my balls.  River keeps going, I suck her nipples and squeeze her boobs.  "Here it comes."  A long one for River too.  A quickish fuck is just what I've been wanting.