I Shouldn't Have Gone To The Doujinshi Convention Without Telling My Wife 1

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~