Once I was having it with a girl (Rachel) in her parent's bathroom, we were in the shower. After we'd done the whole foreplay in the shower bit we went into her room and I started ****ing her, all was going well for a couple of minutes when we heard her parents walk in the front door. This scared the absolute shit out of her (being a strict catholic and all that) so her cervix contracted because she got worried and my cock was stuck in there while we could hear her mum calling her from downstairs. So i was doing all i could to get mini-me out of her pussy but it ended up being stuck there for 10 minutes and her parents didn't even come up the stairs as they thought Rachel must have been out.
I haven't seen her since.