Not the girls, Xavier is trying to forget the evening after accidentally seeing Zero's cock while taking a shower.
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To be fair I imagine telepaths have a pretty high tolerance for disturbing and provocative stuff, imagine being a telepath for a high school class, the amount of horny posting and stupid shit radiating out of them would require a lot of self control to block out or manage, now add on to that those teenagers have superpowers they can use during sex. Thats what Charles deals with on a daily basis and he still keeps his cool.
Seeing a normal mans above average dong is nothing, just imagine going through Emma's mind, dude has seen that cock in first person view up close and personal in ways no man ever should.