Jacob is watching porn

Isabella realizes that her boyfriend is just watching porn. He probably is just on PornHub or something watching some poor starlet sell her soul for some quick cash. Maybe he's watching some young girl whose boyfriend promised he'd never share the video with anyone...

Very quickly Isabella has a turn of heart. Was Jacob lusting after some porn star or amateur slut any more ethical than what she's been doing with you and Emma. Both she and Jacob are getting their jollies outside of their relationship.

She decides to (quietly) march back into the bathroom. She looks at herself again in the mirror. She fills a glass with water and then pours it over her ample chest until her t-shirt is basically transparent. "Oops" is all she types when she sends the wet t-shirt photo along to Emma (and thus to you as well).