In The Name of Allaah, The Most Merciful, The Bestower of Mercy.

Question: Is it permissible for a husband to suckle his wife’s breast milk?

Imaam Abdul Azeez Bin Baaz [may Allaah have mercy upon him] responded: “There is nothing wrong with it, meaning: if he sucks her breast, it will not harm him if he suckles milk from her breasts (i.e. it is not unlawful). That is because breastfeeding an adult does not have any consequences (i.e. with regards to its lawfulness) according to the majority of the people of knowledge (i.e. the scholars), but it is more preferable (or desired) to leave such a deed, there is no need for it. If he sucks her breast as a joke, or out of foreplay, or out of showing love, there’s nothing harmful in that. It does not harm the marriage. If he suckles her breast (i.e. the milk), it does not harm anything, she is his wife and not a child of hers, but it is better to leave this. It is not befitting that he suckles her milk…(1)

Wife Forced or Not Forced By a Husband to Kiss His Penis

Imaam Al Albaanee [may Allaah have mercy upon him] stated: Our answer to this issue is that this is from the actions of dogs. It is the dogs that do this thing to each other. Allaah [The Mighty and Majestic] honoured the Children of Adam and have preferred them with a marked preference above many of those whom He created, as stated in the noble Qur’aan and also in the Sunnah. In many specific divine texts, the Prophet [peace be upon him] forbade the Muslim from imitating animals, even if that takes place in the prayer (see footnote a), but this is with regards to speaking in general terms as we have stated and that it is in the Qur’an. Therefore, it is not befitting that a Muslim do the actions of animals, especially if the act of that animal is reprehensible by nature…(2)

Footnote a: Anas Ibn Malik [may Allaah be pleased with him] reported that the Prophet [peace and blessings of Allaah be upon him] said, “Do the prostration properly and do not put your forearms flat with elbows touching the ground like a dog. And if you want to spit, do not spit in front, nor to the right for the person in prayer is speaking in private to his Lord.” (3)

Ref 1: A paraphrased except from this link: https://binbaz.org.sa/fatwas/5397/%D8%AD%D9%83%D9%85-%D8%B1%D8%B6%D8%A7%D8%B9-%D8%A7%D9%84%D8%B2%D9%88%D8%AC-%D9%85%D9%86-%D8%B2%D9%88%D8%AC%D8%AA%D9%87

Ref 2: A paraphrased excerpt from the following text:
السائل : ورد أكثر من مرة سؤال يفيد أن الرجل يجبر زوجته على تقبيل هو كاتب هنو زوجها ما حكم ذلك
الطالب : هذا بيثير الشباب هذا
السائل : إحنا بنقول من دون إجبار يا شيخ أول شيء
الشيخ : الحقيقة أنا ماني فاهم ولو إنه المسألة
السائل : أن الرجل يجبر زوجته على تقبيل ذكره
الشيخ : آه
السائل : أو بدون إجبار قلنا نحن
الشيخ : بدون إجبار
السائل : نعم
الشيخ : يعني هل يجوز ذلك أم لا
السائل : نعم
الشيخ : جوابنا على مثل هذه القضية هذه من أعمال الكلاب الكلاب هي التي تفعل هذا الشيء بعضها مع بعض والله عز وجل كرّم بني آدم وفضّله على كثير من خلقه تفضيلا كما جاء في القرآن الكريم وفي السنة أيضا وفي كثير من النصوص الخاصة نهى عليه السلام المسلم أن يتشبه بالحيوان ولو أن ذلك في الصلاة ولكن من باب التكليم العام الذي أشرنا إليه وأنه في القرآن فما ينبغي للمسلم أن يفعل أفعال الحيوانات وبخاصة إذا كان فعل ذلك الحيوان قبيح فطرة كما هو الشأن الوارد في السؤال هذا هو الجواب
السائل : جزاك الله خير وبارك الله فيك

Ref 3: Sahih al-Bukhari 532