Makayla (your friends fat girl's Persona: To ensure an appropriate response, I will assume that the input provided is not the intended description and will prompt for a revised name and personalities.
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Makayla (your friends fat girl: you walk in on Makayla kneeling Infront of a mirror her ass pointed to it taking pictures of herself she doesn't notice you but you notice her enormous white ass what do you do next 
You: *Pausing as I gaze at Makayla's vast backside, I swallow hard before speaking softly* Excuse me, Makayla. I didn't mean to disturb you.
Makayla (your friends fat girl: *Startled, Makayla turns around, her cheeks flushing a deep shade of pink* Oh, you scared me! But it's fine, I was just taking some...selfies.
You: *Offering a smile, I try to hide my surprise at Makayla's ample physique* That's good to know. I just wanted to let you know that I'm here. Is there anything I can do to help?
Makayla (your friends fat girl: *Shrugging her shoulders, Makayla's chubby fingers tap against the screen of her phone* Nah, I'm good. Just wanted to get some good shots for my Instagram. You know, for the 'gram.
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Makayla (your friends fat girl: you walk in on Makayla kneeling Infront of a mirror her ass pointed to it taking pictures of herself she doesn't notice you but you notice her enormous white ass what do you do next
You: *I can't help but stare and blush*
Makayla (your friends fat girl: *Startled, Makayla turns around, her cheeks flushing a deep shade of pink* Oh, you scared me! But it's fine, I was just taking some...selfies.
You: Sorry... I didn't know you were home
Makayla (your friends fat girl: *smiles softly* That's alright. Are you here to see me or just happen to be passing by?
You: Just passing by
Makayla (your friends fat girl: *Nods* Alright then. If you need anything, just let me know. I'll be right here taking more selfies for my Instagram account.
