He rubs her padded crotch

Rick begins patting Abby on her diapered crotch. He is slowly patting her, Letting each swipe of her most private part of her body be violated by his hand. But then gradually, he begins moving his hand back and forth along her diaper. He starts stroking, back and forth. Mark just watches in interest.

Rick looks down at her, and he notices she has closed her eyes, trying to find some sort of comfort. Rick smiles and quietly tells her to open her eyes. Abby, fully aware of what the boys had done earlier, opens her eyes and begins to recognize what he is doing to her.

The stroking gradually becomes more fervent, the rubbing much firmer. Harder and harder, more and more. Abby's hips begin to meet his hand, and soon she starts to buck against his hand. She soon starts to breathe harder and pant. "No!" she whispers. "Please no!"

"Please what, Baby Abby?" Rick asks.

"Please don’t make me cum in my diapers!" Abby begs, admitting the power that Rick and his brother now possess over her.

Unfortunately for poor Abby, Rick doesn’t relent and within moments, she is experiencing a powerful orgasm. She begins to moan and groan as the waves of pleasure start circling through her body, originating from her diapered crotch.

By the end, she is breathing heavily, just letting the pleasure wave off and waiting for the shame and humiliation to come.

"Nice work, bro," Mark congratulates his younger brother as he gets out the roll of tape and tears off another peace. He then places the piece of tape over Abby's mouth, smoothing it out carefully. Now she is absolutely helpless in her bound and diapered state.