My character is the 17 year old cute-faced Tommy, your character is the handsome 30-something Donnie Brasco.
Donnie can either be Tommy's uncle, or just a close family friend. Either way, he's been coming around for years doing clandestine mafia business with Tommy's father Rocky while the boy watched on the sidelines. Tommy's always had a crush on Donnie, and Donnie happens to be either bisexual or gay.
Tommy makes a point of brushing against him, walking around shirtless and making suggestive conversation when he comes over. He's a flirt, and his body is starting to transform into that of an attractive young man's. How long will Donnie be able to brush it off..? Will Tommy go so far as to wander into the shower with him as a surprise?
Though Donnie will most likely be dominant in sex, Tommy is very sensual and will often iniciate physical/sexual contact. He's extremely attracted to and curious about Donnie's physique.
(Below is Donnie from the film "Donnie Brasco". If you like, you can change his look.)