He gets hard

Todd’s doubt and fear faded, replaced by the sound of his dad’s words, especially that word—boypussy—ringing in his ears, and an awareness of his dad’s cock still stretching his hole—no, his boypussy—open. Todd felt the blood pulsing in his sphincters as they stretched open around his dad’s cock, and he felt his own cock stiffen, pointing straight into the air.

Jack leaned forward, smiling that wicked smile, and pressed his lips against his son’s still-open mouth. As he did, it was as if Todd snapped out of a trance. The two began furiously kissing, tonguing, groping one another, and soon Jack was thrusting into and out of his son’s ass again. Every time he pulled his cock out, it was coated in some cum from his last load, and it trickled down Todd’s crack and pooled at his lower back and dripped onto the bar and floor. Jack finished off by firing another large load into his son’s butthole, and he slipped his dick out of his son’s now wide-open, sloppy boypussy, and they finished making out.

Later that night after fucking several more times, the two heard the garage door open and looked at each other with fear.