Big bro can you take a picture for me? M4F

Can I have some advice big bro? M4F

It's a rainy weekend and our parents are out for the night, so we are left to our own devices at home.

My sister gently knocks on her brother's (me) bedroom door and asks if I would do her a favour. She wants to take a picture to send to her new boyfriend. Nothing dirty just something fun and sexy,

What should she wear? What type of picture? Advice needed from her big bro.

It's an awkward interaction at first but we soon become more relaxed.

So looking to roleplay.