This is based on part true experience this was back in 1990 my first story too so be kind.
It was Johns dads 40th birthday John was dressed smart in a dark grey suit. It was a surprise party in a hired bar plenty of drink music was playing lots of family and friends. John was 19 at the time and a shy virgin.
There was a family friend in attendance Denise was her name she was 27 at the time she was not a large woman but slightly overweight but had nice size tits she was wearing a shortish blue dress that showed plenty of cleavage.
The drink was flowing John had liked Denise for ages was a bit shy. John had a few drinks plucked up went over to the table where Denise was sitting asked Denise how she was and the usual small talk asked if she would like a drink she said a vodka and orange so John went to get her a drink came back with a drink for both a beer for John a vodka and orange for Denise.
John was chatting to Denise about stuff in general then some slow music came on John asked Denise to dance she said ok why not so John led Denise to the dance floor.
John was a normal horny teenager at 19 as they were dancing he started getting an erection but thought I hope Denise does not notice as they were gyrating to a slow dance. John was copping a feel of Denise as they were dancing the night was getting late and people were leaving so john being the gentleman he was asked Denise if she wanted walking home as she lived about a 10 minute walk away.