:The Succubus Fantasies:

She shrugs, reassured by your confidence and carries on eating. You suspect that, like you, she's also finding the food addictive. It's so satisfying to eat, a delight on your tongue, but consuming an item does nothing to fill you up - it only makes you hungrier for more. You both eat. Your shirt is taut over your belly now and the waistband of your shorts feels like it's digging into your belly. This is not ordinary food, but it's just too good to stop.

Your sister too is bulging out of her shirt. Gaps are stretched open between the buttons, which look like they're straining to contain her expanding body. You certainly notice her breasts have bulked out considerably, pushing out from all sides above her full and rounded stomach.

"We're getting too big for our clothes" she announces.