Tsuma ni Damatte Sokubaikai ni Ikun ja Nakatta

Protip if you have a significant other: make sure you have enough sex so neither of you is left sexually frustrated. Our heroine Yumiko was left in that state by her husband when he went on a business trip (actually, he went to Comiket), so when a young, horny stud of neighbor came over, she found it very hard to resist his advance~
(Source: Fakku!)

1. chapter 1 (第1章); Comic Market 94
2. chapter 1.5 (第1.5章); COMIC1☆15
3. chapter 2 (第2章); Comic Market 96
4. chapter 3 (第3章); Comic Market 98

Notes:
- The author wanted to put the story of chapter 1.5 into chapter 1, but didn't get to so he published it later in the spring as an extra.
- A live-action AV adaptation (URE-074) was released on November 9th, 2021.