Both epics feature couples that you might want to write about. From the Ramayana, consider Rama and Sita, Ahalya and Gautama, Rambha and Nalakubara, Kaikeyi and Dasaratha, or Mandodari and Ravana. In the Thai version of the Ramayana, even Hanuman falls in love - with a mermaid named Suvannamaccha.
In the Mahabharata you can look at Santanu and Ganga (and Satyavati), Pandu and Madri (and Kunti), Draupadi and her husbands, Abhimanyu and Uttara, Nala and Damayanti, and Satyavan and Savitri.
There are also some very famous Hindu love stories that are not part of the epic readings we are doing for class, such as the story of Krishna and Radha or Shakuntala and Dushyanta.
The goddesses and apsaras are also involved in some passionate love stories; see the page about goddesses for more information.
Some of the most famous love stories involve a swayamwara, a marriage test, which would make a great topic for a Storybook. The swayamwara is important for the stories of Sita, Amba, Draupadi, and Damayanti.
You might also be interested to learn more about the Hindu god of love, Kamadeva; like Cupid, he wields a bow and arrow, as you can see in the image below.