Wait outside the room door.

Bella then quietly went up to the door she was hearing the noises from. She noticed the door was open a crack and couldn't help but peek inside.

In the room was her son Derek fucking a elf girl from behind holding her arms back. "You really needed this, huh?"

"Ah yeah!" The elf said back between moans. "And..I won't get...pregnant right?"

"Of course not. That's what the magic is for. Just relax and let yourself go. I'll make sure you get off properly"

Bella was proud to know Derek was focusing on her pleasure. Also, the elf looked like a prude who needed a good fuck.

Just then, the elf screamed as she came hard. She then collapsed on the bed with Derek's cum dripping out of her just-used hole. Derek then helped her into the bed sheets to rest.