https://www.dlsite.com/books/work/=/product_id/BJ274344.html
As always, please support the artist and buy his works.

I'll have sex with my childhood friend until I use up 100 boxes of rubber!

"The real thing begins after you put on the rubber band...!?"
Practicing how to use condoms with your childhood friend!? I'll teach you how to use 100 boxes of condoms!
Takuma was forced to buy 100 boxes of condoms out of his own pocket after he mistakenly ordered them at his part-time job.
Then, his childhood friend Rin comes to visit him and sees the large amount of condoms. He is so vain that he tells her, "I bought a box of condoms because I'm in a period of popularity! I bought a box of them," and then she asked him "If you have so much experience...can you teach me how to wear it?"...!?
Rin rubbed her pussy with the slippery rubber, and she let out a sigh and felt a little scared. She is so sassy that you can't imagine how excited she would be with just one rubber!

English webtoon version (complete): /g/2452599/255a481352/