He asks Chloe; they can't hold back

Zack knew he wasn't going to be able to hold back with his rock hard cock in the cleft of his best friend's panty covered ass, but instead of letting himself go, he decided to ask Chloe, just to make sure she was fine with it, or if he could get out for a second to relieve himself.

“Chloe,” he could barely stifle back a moan.

“Zack?”

“I can't do this.”

“But I want you to hold me...”

“If I continue to do so, I'm going to do something we both might regret.”

Zack knew she was thinking, but he wished she would hurry up. He wanted so badly to hump her.

That was when he felt it. Chloe had begun move her hips up and down, along his shaft. Zack let out a stifled moan into the back of Chloe's head, in doing so, taking a whiff of her flowery shampoo. He moved his hips with Chloe's, matching her timing.

Zack then felt Chloe's hands grab his, moving the hand which was underneath her to grab her breast, and moving his other hand down toward her pussy. He could feel the softness of her breast, how it could barely fit in his hand, and her rock-hard nipple underneath his palm, while he slowly slid a finger of the other one up and down her pussy, trying to find her clit.

Zack had a thought in the back of his head, that this was something he didn't think Chloe would do, but the thought was pushed into the back of his head by his lust as he found her clit and Chloe let out a stifled moan of her own.

After a few minutes (although it seemed like much longer than that), Zack could feel his himself about to cum, “Chloe,” he moaned into her ear, “I'm gonna cum.”

Chloe responded by bringing one of her hands down with his at her pussy and helping it with rubbing her clit, and increasing the speed of her hip movements.

Not long after, Chloe began to spasm next to Zack with a hand over her mouth in order to keep her moans in and her legs closed with a vice-grip around their hands. Her spasms pushed Zack over the edge, and he let out a long moan into her hair, as he shot out cum inside his boxers.

The moments passed with Zack's head clearing, and his thoughts rushed back to him. He felt guilty, but at the same time relieved and something else he couldn't point out.