Person A of your OTP loves to watch the face of Person B reach their climax.

John loved to watch Joss as she came. It would first start with breathy sighs and her body would begin to relax. The closer she came to climax, the sighs would change to moans, deep moans. Her lips would part slightly as she began to pant and her eyes fluttered shut.

He loved coming to know her body. Her sweet spots, her ticklish spots. Places where he should nip instead of lick, kiss instead of bite. Where to caress softly and where to apply more pressure. Her moans were deeper now and he felt her start to clench around his fingers, slick with her arousal. He pressed his thumb harder against her clit and curled his fingers upward as he increased the pace.

"Come for me. Tell me how much you like it."

She moaned deeply and gripped the sheets. Her hips lifted from the bed as she began to move with each stroke of his fingers. "Mmmm, I love it. Faster baby. I'm almost there." Her walls clenched around his fingers as she grew wetter with need.

"Tell me what you want, Joss."

His pace increased as he lowered his head to take a nipple into his mouth. He wanted her so badly but he wouldn't give in. Not yet. He wanted to make her beg. He wanted her to need him and want him as much as he needed and wanted her. He bit down on her nipple with just enough pressure to be slightly painful.

She was there now. Her body stiffened as the orgasm hit her and he lifted his head to watch her face. Her expression reflected the pleasure she felt coursing through her body.

"Tell me what you want, Joss," he repeated, waiting for her reply.