[Shipuolu] Oji-san no Otomodachi [EHCOVE]

Little Tsumugi and the older man she calls her 'adult friend' share a secret sealed with a promise — he won't tell anyone, and neither will she, a pact that binds the two lovers together in their private game. What began with her mouth now escalates as he coaxes her trembling, tiny body open for something far bigger, murmuring that it'll be just like yesterday while her small frame shudders through sensations she's never felt before. By the end she's swallowing everything he gives her with teary, blissed-out gratitude, sighing that today's was extra sweet and delicious.