Konosuba - God's Blessing on This Wonderful World! Vol 8

From the Yen Press edition

After Yunyun proclaims her desire to bear Kazuma's child, she wastes no time fleeing to her hometown-the Crimson Magic Clan's village! Kazuma and the gang chase after her, but the path is rougher than he imagined...Wait, who's offering to have his kids now?!

Source: Yen Press