What a sweet girlfriend! She used the same method from the previous chapter to loosen her vagina. She has had so many solutions to his "problem" penis.
Some great tags on display, definitely.
"I think I've finally loosened it up enough for you"? A...worrisome sentence, but I believe in the Vanilla tag.
And in the end it turns out she was using a dildo in preparation for him. Well, considering she mentions the size being the same as his, did they perhaps try this before and it didn't go too well, therefore she decided to 'loosen it up' while holding out until graduation day?
What a lovely ending though. Yeah, together forever, what a great phrase indeed.