I can play either role/gender in all the games below.
Cowgirl (f/f, m/m, or f/m)
A lonesome gunslinger comes travelling across a farm, asking for permission to spend the night in the stable. The farmers agrees, having gotten some coin in return. However, his young offspring takes a fancy to the gunslinger and sneaks off into the barn at night. The gunslinger could be a version of Calamity Jane for a f/f pairing, or a male for a m/m or f/m pairing.
Neighbour (f/m or f/f)
A lonely boy falls immediately in love with the new girl in class. She is stunningly beautiful, mature and wise beyond her years; above normal rules of cliques and class and social groups. For some reason she takes the boy on a ride of friendship, love and lust that he will never forget. Primarily looking for a f/m pairing here, but I can also go with a f/f one.
A young girl with enormous breasts is 'babysitting' her brother and his male friends. The boys convince the girl to show them her big breasts and let them play with them...
A female cop or agent has to go undercover as a porn star to investigate some criminals. I will either GM this game for another player or play the female myself with another GM.