Fics like 8 minutes.

Doofus has a very short stamina but Zero has a longer stamina. Doofus often gets too overstimulated by Zero when they do their activities so they always stop before Zero finishes, leaving Zero dissatisfied. Doofus always feels guilty leaving him like that so he decides to push through and let Zero go rough on him. or Doofus and Zero bang but Zero has a long stamina so Doofus starts being whiny.

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