Gobaku  

誤爆, Gobaku: Moe Mama Tsurezure, 誤爆～萌えママ徒然～

Haruka views Hiro, who is her best friend's child, as part of her family. However, their relationship becomes complex when Hiro reveals his romantic feelings for Haruka and attempts to seduce her while her husband is away on business. Despite recognizing that their actions are wrong, Haruka tries her hardest not to hurt Hiro but ultimately succumbs.