I don't normally read anything with a naroukei title if I can possibly help it, but saw this recommended by a Twitter account I generally trust for its lovely artwork. It really does have lovely art!
Bit icked out by the premise, though - anything with a romantic element that also involves parenting is just weird, as is the reversed age gap in the future timeline. I haven't read any more of the web novel than that which corresponds to this chapter (and the dialogue's a pretty direct lift) so I don't really know how it develops.