One night, my super-serious sister came home drunk and then came to my room, spouting dirty jokes! She took off her clothes, showing her underwear! She rubbed her breasts against me and even tried to take off my pants, lewdly going wild with lust! Helpless, I let her sleep in my bed... When she woke up in the morning, she seemed to have no memory at all! Why? Naked?! My sister was blushing and squirming in embarrassment, looking incredibly cute, and I couldn't help but get an erection! Then, noticing my erection, she got excited, and we ended up having sex...
