One of the stories about Kartikeya (Murugan) if you have not read it:
There was a demon named Tarakasura. He worshiped Lord Brahma and extracted a boon from him that none else but the son of Lord Shiva would be able to kill him. Shiva at that time was deeply engaged in his meditation which had continued for eons. Tarak thought that he was invincible since Shiva would not father a son. He went on to defeat all people in the world including the lesser Gods lead by Indra.
So now, Gods had a problem. how to break Shiva's meditation. They enlisted the help of Cupid (Kamadeva). To create a congenial atmosphere, Kamadeva creates an untimely spring (akāla-vasanta). He evades Shiva's guard, Nandin, the bull, by taking the form of the fragrant southern breeze, and enters Shiva's abode. Kamadeva shot his arrow, decorated with five fragrant flowers with bow made of sugarcane and which had a string of honeybees.
The five flowers are Ashoka tree flowers, white and blue lotus flowers, Mallika plant (Jasmine) and Mango tree flowers (
Kamadeva - Wikipedia). Shiva's meditation is broken but he is mightily displeased. He burns Kamadeva to ground with his third eye. At the request of Kamadeva' wife (Rati - engagement), he is revived later as Lord Krishna's son, Pradyumna.
But then what was done was one, meditation broken, Shiva went to cohabit with Parvati engendering Kartikeya. Kartikeya, later led the army of Gods and killed Tarakasura, Indra, in gratitude, got his daughter, Devasena, married with him. That is one story. The other does not involve any marriage, and shows him as an ascetic and celibate.