Rear ended, literally…

Im going to get straight to the point, today me and my man were going at it doing missionary and I was very wet, and his penis slipped out, him thinking it’s still at the entrance of the hole, he goes to put it back in, quite forcefully (as we like it)… turns out it was the back end instead! Very unexpected and painful, he felt so bad. But my rear is a bit torn up now, any suggestions to help it heal quicker?