Tomorrow is the day that my little sister and I have to watch over the house by ourselves.

"So tomorrow is the day... it'd be okay to do that..."
And that's how the little sister invited her brother to do it, getting his hopes up; but on the day itself she fell deeply asleep while taking a carefree, daytime nap.
Her brother, feeling horny and unable to hold back, began rolling up his defenseless sister's clothes...

This is a doujin manga about a brother and sister who's all flirty and lovey-dovey + sleep sex.

(Source: DLsite, translated)

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• Tiger — Story & Art