Let her do it herself

You pull out, and Belle protests, whimpering that she needs to cum.

"Do it yourself then, my little bitch."  You say, tossing her a dildo.

She looks at you pledingly for a second, and then shoves the vibrator deep into her pussy and turns it on max. 

"YES! YEEES!"  She yells, as she orgasms violently, and then passes out.

You pull the dildo out of her, and, parting her pussy lips, jerk off, squirting your cum into her vaginal cavern. Hey, she wanted your cum in her... she got it!