I would wait until she wakes up, and then ask her why she is here and be here friend. Then I would ask how she got here! :)

Make love with her

When she's asleep? At least wake her up first!

True

I'd be making sure Discord isn't coming around anytime soon, then I would wonder why Fluttershy is in my house and why my grandma hasn't wondered the same exact thing. Also, how come my loud younger brother hasn't woken her up?!?!?! I'd just be filled to the brim with questions

Inactive

Explode from joy. Most likely in a very messy fashion that becomes emotionally traumatising for poor Shy. She would be covered in little bloody bits of person, after all.