You always had thought Emily was hot. It was incestuous, but how could you deny it! She had such nice long legs, nice hips. Yeah, she wasn't blessed in the boobs or ass department, but she they were still substantial. Plus her face was cute.
You sat down next to her and touched her thigh. She didn't react. You stroked her thigh. She still didn't react.
"Emily, would you like to take your pants off?" You ask.
"Yes, it is currently hot. I will remove my pants and shirt." Emily answered.
Without any flourish, she mechanically removed her pants and shit, revealing cute boyshort panties and a black sports bra that flattened out her breasts. She sat back down without comment.
Emily had recently been broken up with and hadn't been getting any for a little while... you wondered if she would accept you in this state.
"Emily, are you horny?" You ask.
"I am currently not horny, but I am eager for more sexual intercourse or at least making out and physical erotic touch since I have not had any sex for 4 months. I appreciated your stroking earlier, it eased my need for sex." She said.
Well, that was pretty straightforward. You removed your shirt and pants and pushed Emily down onto the bed. She looked up at you without emotion. You kissed her gently, and she grabbed you by the back of your head and pulled you in deep for a tongue kiss. It was... strange. Clearly erotic but lacking passion. She rolled over and pushed you onto your back, straddling you with her hips. With a smooth motion she undid her sports bra letting her breasts hang free. She had cute nipples.
You reach up to feel them. She grabbed your hands at the wrist and forced you to take a harder squeeze. Her breasts were soft and pert.
"Do you want more of this?" You ask.
"Yes, I have quite the buiild up and this is easing my need for sex. I am becoming horny." She answered.
She sat back and took her panties off, you quickly took your underwear off. Your cock was quickly hardening to its full 6.5 inches. She took it in a graceful motion and began to give you the most masterful but strangest blowjob you'd ever received.
Beyond the fact that it was your sister blowing you, she was quite the expert on it but you felt no passion or desire in her. It didn't bother you too much and you were close to orgasming.
"Emily... I'm about to cum." You say desperately.
She looks up at you with emotionless eyes and keeps her mouth firmly affixed to your cock. You unload and she swallows.
"That feels better. My horniness is still high but my need for sex is at acceptable levels." She said. You could smell your cum on her breath.
"Would you like me to eat you out, at least?" You ask. You felt bad about recieving but not giving.
"Well that would aid my horniness, I do not desire it. In fact, I doubt you will be able to give me an orgasm more efficiently than my vibrator." She said as she stood up.
She had just started opening the door when you said.
"Wait! Emily, your clothes." You said.
Emily looked at them and then looked back away before continuing out the door.
"...I know you don't care if you're seen naked, but you should at least take them with you." You say.
Emily closed the door and nodded.
"That is logical. I will put my shirt and pants back on. It is too much work to put the bra and panties back on." She said.
She did just that and left your room.
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You got up and looked through Emily's drawer. You check through her memories, this escapade had made it into her memory but she had no emotional content attached. You could, uh, lobotomize her and remove the memory but if it was a neutral memory that didn't disgust her maybe you could just leave it in.
You also looked at the personality folder on top of the drawer. You could continue to leave it out... but her emotionlessness might worry your family (unless you modify them) and her friends (which you couldn't modify anyway).