45-sai Oji-sama ha Bukiyou na Kemono -Konya Otona no Sex wo Oshiete- / 45歳、おじさまは不器用な獣。 / Mr. 45 Years Old Beast / The 45-Year-Old Gentleman Is a Tactless Beast -Tonight, Teach Me How It's Supposed to Be Done...-
Rank: 887th, it has 603 monthly / 14545 total views.
Genres: Manga / Josei / Romance / Smut
Status: Ongoing
Summary:
Seeing the desire in the polite gentleman's eyes broke the dam that kept her bottled up emotions at bay...

On the night Shihori Ogasawara finds out the coworker she had feelings for is engaged to another woman, she happens to bump into a customer she helped earlier that day! His receptive ear and comforting shoulder lead to a night of passion... Firm hands gently caressing her body, like handling a broken treasure, his warm features make Shihori's heart race as she gives in to the ecstasy... He returns to ask her a question before making his request...
Will a 45-year-old gentleman and a heartbroken 27-year-old find romance in this love story with an age gap!?
Notices:
one of my fav age gap manga all the time! ;P
support the author by buying some chapters

I will continue update this one, if I'm late please ask me first! 
please do not interfere with other people upload. have some respect. - forfun
Resources:
https://www.ebookrenta.com/renta/sc/frm/item/140869/