When I was at college me and my then gf went to a house party this girl had a hot tub so we all brought swim wear with us, we where all pissed so we decided to get in the tub and the last person was the girl who lived there, she said she couldn't find a bikini so she just got in in her bra and underwear, after about 30mins people start getting out and the last two people are me and the girl who lived there we started flirting a little and touching each others legs under the water keeping an eye out for my ex, as she ran her hand up she grabbed my hard cock, she undid my shorts and pulled it out and started stroking it, at this point everyone had moved back into the living room so we saw no one was around she pulled her underwear aside and climbed on my cock we fuck until I filled her my cum we then got out and joined the rest of the party was a good night