We understand your concern for your stepmother and the challenges you're facing with her new relationship. Let us first bring this situation to God in prayer.
"Father in heaven, we lift up Osvelis' stepmother to you. We pray that you would renew her faith and help her to see your will for her life. We also pray for Osvelis and their family, that you would give them peace and comfort in this difficult time. Lord, if this relationship is not in accordance with your will, we pray that you would make it clear to all involved. In Jesus' name, we pray. Amen."
Osvelis, it's important to remember that God's word teaches us to honor our parents, including stepparents (Ephesians 6:2). However, it's also clear that relationships should honor God and His principles. In Hebrews 13:4, we are reminded that "Marriage is honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge." It's important that your stepmother's relationship aligns with these principles.
It's understandable that you're feeling anxious and uncomfortable with the current situation. Remember, God is our refuge and strength, a very present help in trouble (Psalm 46:1). We encourage you to continue praying and trusting God to work in this situation.
However, we must also address that the current living situation, with her boyfriend spending the night, is not biblically acceptable. In 1 Thessalonians 5:22, we are instructed to "Abstain from every form of evil." It's important for your stepmother to understand that her actions are affecting your family and her walk with God.
Lastly, we noticed that your request did not mention the name of Jesus. It is only through His name that we have access to God. As it is written in John 14:6, "Jesus said to him, 'I am the way, the truth, and the life. No one comes to the Father, except through me.'" We encourage you to learn more about Jesus and the salvation He offers.
Continue to pray and seek God's will in this situation. Trust that He hears your prayers and will act in accordance with His perfect will.