An interesting subject. I especially like it in relation to the time period that you’ve chosen.
Below are some suggestions to consider:
• Do some light research on homosexuality during the Middle Ages just so you can further push your argument as well as to enrich your dialogue with historical facts.
• Add more context at the beginning of your dialogue, it seems vague.
• Re-read your dialogue out loud, there are some parts that are not so clear.
• Push your immorality argument further – For instance, according to Christian cannons, intimate relationships should only be enacted for reproductive purposes and not at all for pleasure.