[Jerking back against his hand when Iwaizumi's rhythm gets ruined and his hand jerks into him, he moans loudly, unable to keep himself quiet for that press and he struggles with himself to not squirm - his fingers were right against his prostate like that with the curve, oh god it was too much all at once and he's gasping. He hears that call for wait though and drags his hand right back up his body, shivering hard and gasping.]
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Oh god, Hajime!