question says it all... but more insight:
when were making out and I can basically feel his crotch which seems really... warm
Most Helpful Guy
Warm = blood. Blood = erection.
But yeah, when I was first dating my girlfriend (second base max) it of course gave me erection while we were making out. I knew that she would freak, though, so my brain kinda didn't allow full-on erections. Perhaps this is where you and this guy are at.1