did he enjoy the experimenting at the band comp.? if he did he might be keen to do it again. if he didn't it might not be worth asking him. the best way to ask is being up front, the longer you leave these things the harder it will be. as for your other question, the only thing that happened with me is a friend stroked my shaft and gave me a good hand job when he slept over one night when we were both horny. apart from that i haven't experimented much so i'm not sure.