Sure...

Her wetness on your cock convinces you to give it a go. You grab her thigh from behind, lifting it up as you slide downward a little, angling in to her pussy from behind.
"Mmmmmy faaaavorite..." Jenna loves this slow, spoon fuck position. You lay one leg over her bottom leg, and angle your body away from her, until your dick slides up and in with ease, and you begin the relaxed, super sensual sex of two people on the edge of consciousness. It's nice for you, because you can lay on your side and relax, and the angle is good for Jenna.
"Mmm... I love that dick so much." She reaches back to grip your shoulder, squeezing, "And the man it's attached to, of course..."
"Love this pussy too." You pause for a second, and then... "and the woman it's attached to." She chuckles, then settles into a sexual breathing pattern of moans and sighs.
After a few minutes, you roll her onto her elbows and knees, and fuck her doggy for a little bit. You can really get deep on her, bending her knees to really stick her ass out. She begins screaming, muffled by a pillow caught in her teeth, and shudders in a small orgasm.
Unfortunately, your libido is proving to be insufficient to war with overstimulation and fatigue. You're starting to go soft, and you aren't going to cum tonight.
You pull out and lay on your side, panting.
"Thank you baby. I'm sorry, you didn't...."
"Just tired, love." You kiss her. "Just tired. I love you."
You drift off, a little frustrated, but not angry.