As Mark's hard cock bobs enticingly, a twink's imagination runs wild. He wishes his forearm could replace his own hand, pumping Mark's length with expert precision. The fantasy is so vivid, he can almost feel the heat of Mark's body, the weight of his cock in his imaginary grasp. The twink's own dick aches with desire, leaking pre-cum as he envisions Mark's explosive orgasm, his cum splattering across his chest and abs.