Make use of those undies

You pulled down his briefs, with his erect rod flopping out, profusely leaking precum. You noticed his briefs looked old, and had a large hole by his crack, which is probably how he had easy access to his hole. You grabbed the a pair of the undies he was going to try on, and use them to jerk him off. Liam moaned, tweaking one of his nipples in a bid to cum. After aggressively jerking him off for several minutes, Liam shoots a load all over the pair of undies and the wall to the changing room. You kiss him to silence what was going to be a series of loud moans as he pumps his load into the new underwear. Once he finished, you took the pair of underwear and waved it in his face.

"Dirty boy," you jokingly scolded, "wonder what the salesman would say?"

Dropping the pair, you turn him around. Ever since you first kissed him, his fingers have been playing with his hole, opening it and loosening it. Moving the pumping finger, you spread his hairy cheeks and shove your face into his arse. Liam moans, his dick already rehardening. You licked the hairy hole, already red from the **** of his fingers. Pushing your tongue into the tight opening, you rim him well, preparing him for your cock. When you finish, you grab the remaining two pairs of undies. He had brought three pairs in, two being briefs. You'd used on of those pairs, leaving the other pair of briefs, and a pair of tightie whities. You shoved the briefs into his mouth, while slipping the tightie whities up his legs. Once they were fitted around his arse and hard cock, you moved them slightly to get access to his hole. Grabbing your own member, you glided it into his puckered hole. Liam tried to moan, but the briefs in his mouth muffled much sound coming out. You began to thrust in and out of the DILF in the room with you, feeling up his slightly chubby, but still well looked after body. You slipped your hand into the tightie whities, and began stroking his leaking cock. You leaned forward, and began whispering into his ear.

"Dirty slut…" you'd say, "Letting a complete stranger fuck you… your kids right outside… spreading your legs for someone you don't know… opening your hole for anyone… how slutty…"

This drove Liam wild, as he thrusted back into you, driving your cock into his arse. You rubbed his prostate, causing the young dad to go mental, as he filled the tightie whities with his cum. As he orgasmed, his hole squeezed you cock, and triggered your own eruption. You shot your load into his throbbing hole, filling his shoot up with your seed. As you withdrew your dick, you saw his quivering hole fail to hold your man cream, as it leaked out slightly. You took the briefs out of his mouth, and used them to wipe yourself down. Suddenly, Liam shot up, and looked at you.

"Y- you **** me!" He said quietly, shocked.

"You seemed pretty willing." You countered, pulling up your pants.

He looked bewildered, holding his slightly plumper arse and looking at the mess you two had made.

"Here," you threw the briefs you'd wiped yourself with, "clean yourself up. Have fun explaining this to the salesman!"