As much as you loved the idea of sharing some pleasure with this mystery lady, you did have to commend her and reward her trust in you. You decided to let her fuck herself while she also had control over her pussy. She would be fucking herself and feeling both sides of that pleasure.
You took the legs to your bedroom and laid them gently down. They quivered with anticipation. You slowly stroked them on the thigh and rubbed the female vagina in your hand - being careful not to let it attach to you - along the female legs shaft. She seemed to instantly understand and started to dry hump and buck her hips. You smile and start to lick and nibble on the vagina's clit. You wanted to make sure she was nice and wet and lubed for the pleasure to come. You could see the legs calf muscles cramping and her toes curling, she was VERY turned on and it didn't take much to get her all the way ready.
You slowly let her penetrate herself. She shakes. She starts to hump her own vagina with you providing support with you hand and body weight. You help facilitate this continued humping, slowing her or quickening her. She seems to enjoy "reverse missionary" with her legs on the bottom, but you guide her to an ersatz doggy style with her on her knees pumping into her vagina. She seemed to like that better and made no attempt to go back.
She did struggle heroically to withhold her cum, but she couldn't hold out forever. Soon she was cumming into her own vagina and you assumed from the spasms you could feel with your hand she was also experiencing a female orgasm at the same time. Lucky girl.
Her legs collapse, exhausted, and you swear you can see her heaving and breathing by the action of her waist.
"What a fucking mess you've made." You purr, stroking her thigh. She really had, you'd have to clean off her legs before letting her sleep.
She seemed receptive and didn't struggle, maybe she understood what you were doing. You carried her to bathroom and gently washed and stroked her tan, hairless, curvy thighs and hips. You made special care for her cunt as well, which was dripping with her own semen. This was enough to put her to sleep, or so you assumed, and you gently put her in bed.