The mother-in-law who only sticks to things for three days, Yui, has gotten into exercising. She says it's to tighten up her sagging midsection, but Tosya figured she'd get bored soon enough. However, half-jokingly going to check on her, he saw the sweaty, strangely alluring figure of Yui. Of all things, Tosya found himself aroused by her sweat-soaked form. The sweat trickling down her nape and cleavage... Unable to contain his excitement, Tosya instinctively reached for his crotch...
