Spidey has those fabulous web shooters, right? AND there are always some crazy villains out there just waiting to grab a sample of his DNA to clone him yet again~ So Spidey doesn't just go jerk off when he's horny because that would leave valuable DNA splattered all over the ground >:V Because he produces plenty! Spider power and all that jazz jizz!
Instead he forms a nice, tight web.. cocoon of sorts that works quite well as self-made fleshlight and cum catching device~ P:<
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