Dowry And Sexual Harassment Case

My elder brother's wife filed FIR against us and the sections in which she accused us are 498A, 354, 3, 4. The case is mostly based on dowry and torture but in the case, she also mentioned specifically about me harassing her multiples times and also made her MMS in which she was changing her clothes. They married last year in December 2018 and she only lived 2 months at our home due to her studies. All the allegations of her are false. The only thing in the case that concerns me is my sister-in-law's relationship with me was very strong and we were talking on WhatsApp a lot, sometimes the whole night secretly. We were talking like typical bhabhi dever things. But sometimes in the messages, I commented on her undergarments. But she took all things normally and she was enjoying my flirting style and stared flirting to me too like sending flowers, hearts, etc. She was enjoying everything on WhatsApp and she was also responsible for all of this because she continued to talk to me in a friendly manner even after some vulgar messages sent by me. Now after tension between my family and her family, they filed FIR about dowry against my whole family and accused me for sexual harassment. The case is now in court. My question is that what should we do and I want to know that I am in big trouble for harassment.