Bring up LGBTQ+ topics by saying something such as, “A girl in my friend’s art class got kicked out for being a lesbian; what do you think of that?” If the answer is in favor of kicking her out, then beware that their reception to your honesty may be similar. Remember, your safety comes first, so think carefully about whether coming out will put you in danger. Ask for their opinions on LGBTQ issues and celebrities.
Remember—their initial reaction is not their forever reaction.
Remind your parents that you are taking a risk by having this conversation with them, and explain that what you’re doing is an act of trust. If the relationship has gotten to sex already, you may want to leave that out. Unless you have health concerns or need their help and advice in this area, talking to them about sex, on top of revealing your relationship, may be a lot for them to take in all in one conversation. That being said, if they ask and you feel the situation is right, try to be honest - it may help your relationship with them.