Is it permissible to suck a woman's breast during intercourse?

A husband is permitted to enjoy his wife in all ways of enjoyment, except for anal penetration, intercourse during menstruation, post-natal bleeding (nifas), and during the state of ihram. A husband sucking milk from his wife’s breast does not make her forbidden to him, because the suckling that has a prohibitive effect is that which occurs within the first two years of life. Ibn Qudamah explicitly stated the permissibility of enjoyment between the buttocks without penetration. Al-Kasani permitted looking at and touching the entire body. Abu Yusuf asked Abu Hanifa about touching the private parts, and he permitted it. The Prophet (peace and blessings of Allah be upon him) explicitly permitted enjoying a menstruating woman in ways other than vaginal intercourse.