Give me some advice, I'm in quite the situation.

>be me a few minutes ago
>browsing Netflix while sitting on the sofa
>younger sister is sitting next to me on her phone
>we're just chilling and minding our own business
>suddenly, sister readjusts herself, turns her body to lay on her back on the arm of the sofa, legs towards me
>she puts her bare feet right on my lap
>"Anon, my feet are sore. Rub them for me, would you."
>I say no, but my heart is beating a fucking mile a minute
>"Come oooonnn? Please?"
>I'm looking down at her feet, her soles are soft, arched and slightly sweaty, her toenails are painted pink
>actually nice looking feet, but she's still my little sis
>tempted to actually do it
>"Get used to my feet, anon, I'm leaving them on your lap until you give em a good massage."
>she leaves her feet on my lap for a solid 7-8 minutes, dancing them around, crossing them, rubbing my leg, wiggling her toes, flexing them, ect
>try my hardest to ignore them but it's actually really enjoyable
>I eventually tell her I need to go to the bathroom and get up
>"If you rub my feet when you get back I'll wash your laundry for you tomorrow."
>head into bathroom and start typing this

What do, anons? Should i just give her a foot massage? It shouldn't be weird if feet aren't a sexual body part. They're just feet, right? My heart is fucking pounding right now, guys. I kinda want to but i don't know how it will go.