After actually watching "I'm gonna cum! I'm gonna cum inside!" it's no exaggeration to say that this work has opened up a new frontier in erotica. Starting with the surprised expression of a serious female student seeing her teacher's big penis for the first time, the process of her gradually enjoying it is unbearably sexy. The scenes of her wrists being tied, standing doggy style, the angle of her butt in 69, all are crafted to perfection. Especially in doggy style, the way she quivers and reaches climax because of the big penis is clearly visible. The expression on her face in the final scene, wearing a gym outfit and saying "you can cum" on her chest, was also incredibly sexy. The story is truly outstanding, and the contrast between her innocent atmosphere and the intense sex scenes is irresistible. Her rich expressions and the way she smiles while doing sexy things make it hard to hold back. The whites of her eyes right after insertion are downright犯规. In short, this is a work you'll regret for life if you don't watch it. Highly recommended!!