Tsuma ni Damatte Sokubaikai ni Ikun ja Nakatta

Our heroine, Yumiko, is left home alone as her husband leaves on a business trip (it’s implied he lied and just went out to Comiket). She discovers her husband’s porn cache and gets horny after reading a bit through it. The the neighbor’s kid, Kazuya, comes over to deliver some handouts to her and catches her in the act…

(Source: 2D Market)