Guy's Behavior

Guys, do you ever have thoughts about your sisters?

I never thought this day would happen. I have always had such a good relationship with my brother. While we have had our ups and downs, I never thought he would try to do anything sexual with me. But then tonight we were watching anime in his room like normal. But afterwards, he said to wait in his room while he got a drink and he wanted to show me something afterwards (we usually watch videos so I thought it was just that). He comes in and I say "So what did you want to show me?" and he like grabs my arm and squeezes it (not hard) so I say what are you doing and kinda flick him away just thinking he's being goofy but I can tell he's acting weird. And he says "I love you" and I say I do too cause he's my brother and he keeps telling me to come here and like wants me to sit on his lap and at this point I'm just so freaked out and he asks "Don't you ever think about it?" and I say "no, God no I'm going to tell dad" and back away. At no point does he try to force me, show me anything, or anything else. (But it did seem like when I was in the chair and he put his hand on me he was about to lean down and kiss me so that's why I was feeling weird. And he says not to because it will stress him out and the family situation and while that's true I don't know if I feel safe anymore. Firstly, should I tell my dad? Secondly, men, have you ever had thoughts about your sister?
For context, I'm 23 and he's 34. He has aspergers.
Guys, do you ever have thoughts about your sisters?
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