Both mutant powers aren't directly inherited if both parents have an active X gene without their being mad science involved. Peters kids get his powers only when he has them with a normal human woman. Otherwise it's either a total toss-up or one or the other, look at Cable or Nightcrawler for example.
Needs reverse blowjob scene, whoever thought of gifrel was a perverted genius. She could literally blow a guy while he is pumping in and out of another girl; there is no way horny teenagers with superpowers wouldn't use them during sex.
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