hooking up with a possibility curious friend

File: original_87470551.jpg (7KB, 225x225px) Image search: [Google]

7KB, 225x225px

I think he might be at least bi.
I've known him since early elementary school, and we're now college freshman.
He dealt with a weight problem for a long time, and always projected by teasing others, calling them ugly or fat. As we became teens, he started calling things gay, and calling people faggots. Which leads me to think the obvious.
One memory that makes me suspicious is when we were around 14, we were at an all male sleepover, and he clearly was rock hard through his pajamas and didn't realize it. I brushed it off then as just an inconvenient erection at the time.
At one point in our teens, he shared an iPad with his younger brother. Once he unlocked it to let me use Facebook or something, and me being me, went to the gallery to find photos of shirtless men. Not wrestlers, not athletes, just random dudes.
He's expressed before he has a crush on Lana Del Rey, and currently has a girlfriend, but I definitely think he might be at least curious.

I wanna hook up with him. How do I casually offer to blow him or something? Is there like a go to subject, or sentence, or something to make that happen?

Nothing cliché like "ugh bro dude I'm so pent up"

Pic mildly related in a symbolic sense.