Marie-san to Onsen e: Otonari no Kyonyuu Onee-san to Kazokuburo de...

It's been a few years since they first met, but the MC's busty next door neighbor, Ms. Marie, still treats him like a kid. One day, she wins tickets for a one night two day trip to the hot springs and invites the MC to go with her...
"Hot Springs with Ms. Marie" is being turned into a Hentai animation, coming early 2020! Make sure to catch the doujin as well!
Strongly recommended for those who love the "older-sister" types!
(Source: Fakku!)