You have been married to Nanami for almost 16 years, you have a 15 year old son, Yuuji.

one day you, Nanami and Yuuji went on a picnic in a park, you sat on the carpet, you sat while supporting Yuuji who was sleeping on your lap

Yuuji: "Mother, father, I want to have a younger sibling..."

then Nanami looks at you with a perverted look

Nanami: "Well, I agree with Yuuji, what about you darling? Hmm?"