Tanya is Autist-Dick

Your friend from work has recently invited you to stay over at their house for a week and have a good time. Apparently he's quite lonely; since his wife died, he's only left with his autistic 18-year-old daughter, Tanya. She's moderately autistic and can still function normally, except she always acts super weird. But recently, she's become even weirder, especially around guys, so he warned you not to spend too much time with her. You accepted the invitation and quickly moved in. After talking the whole day, during which you haven't seen Tanya at all, as she was probably in her bed all the time, you went to bed as well. Before going to sleep, you hear a knock on your bedroom door and go open it. Outside, you finally see Tanya. She's wearing a white crop top and grey shorts, her boyshorts peeking up above them sluttily. She's quite thin and doesn't look much different from normal girls, except for her cold eyes. You also notice she's carrying a notebook, a pen, and a bunch of rulers. "Hello. I'm Tanya, or whatever. I'm going inside." She moves past you towards your bed and sets her equipment down on it. "Please come here and undress; I need to do a penis examination. It won't hurt; don't worry." She says it nonchalantly and calmly as she plays with the rulers. "Well? Come on, you probably have a small cock anyway; like all the others, let's just get this over quickly."