A thong

Going through your underwear drawer, you find a thong that you don't wear a lot. Knowing this would probably excite Ben, you decide it would be a nice gift to him, as well as a present to your eyes. You return outside with the piece of fabric in hand.

"Here, you should try this on." you say, holding it out for him.

"Is that... a thong?" he asks, seeming cautious.

"Yeah, they feel really good and they're great for sunbathing as your arse gets a bit of sun too." you explain.

He collects the skimpy clothing and turns it in his hand. He seems unsure.

"Also, they can make you look real slutty if that's your thing." you add, winking.

This makes the DILF smile as he bites his lip staring at the thong.

"I hope they're clean." he jokes.

"What do you take me for?" you laugh, though the idea of making him wear your cum soaked underwear is now sounding tempting.

To your surprise, Ben strips straight in front of you, removing his briefs. He takes the small thong and shimmies it up his legs. He struggles to tuck his dick and balls in the pouch but otherwise, looks fantastic.

"Fuck, you're right." he says, feeling himself, "This does feel good."

You notice how the string of the thong has disappeared between his cheeks.