Isabella decides to go through with it

What pushes Isabella over the edge is the pride she has over her big rack. She knows that Emma has small tits. She's seen Emma's tiny chest plenty of times when they've been out shopping or at the gym or spa. There are plenty of ways that Emma reigns superior over Isabella - like having snagged a man with a monster cock... But Isabella's big natural tits will always reign supreme and she enjoys knowing that her friend's well-hung boyfriend (aka you) is obsessing over her big tits.

Isabella ends up taking dozen photos, first just of her tits covered by her tee. Then she decides to risk things further and pulls the white t-shirt over her chest, revealing her large mammaries to the camera. Eventually she settles on sending over a couple photos - one close up of her tits being gently squeezed together by her arm and another that actually shows her whole face. She decided at the last minute that the two of you deserved a face shot considering the contents of Emma's selfies. She's both extremely excited by what she's doing and extremely frustrated that you're not sucking on her titties right now.

"John likes them. A lot," Emma replies quickly. Isabella's face lights up with a big smile, and her hand not holding her phone instinctively goes down her her pussy.

"I do too." Emma admits in a second text and Isabella surprises herself by letting out a small moan. Isabella's brain struggles to think of a reply but she is relieved to see that Emma is still typing.

"I don't know if i've ever seen John so hard." is what comes through next to Isabella's phone, but it's followed quickly by "Can't text anymore..."

Isabella waits a few minutes longer before finally giving up on any further messages from Emma coming through. She knows that right now you are having your way with Emma. Isabella's only consolation is that she knows you're think about her big tits.