Does thinking about watching sexual intercourse without actually doing so, as well as the emission of secretions without lust, necessitate redoing ablution? Is this considered a sin?

We ask God to reward you for your patience and to keep us and you steadfast in truth. We advise you to fast and supplicate frequently. As for thoughts, you are not sinful for them, for Allah has forgiven this Ummah for what their souls whisper, as long as they do not act upon it or speak it. However, recalling and imagining a specific person is forbidden. The discharges that exit from you without lust are vaginal moisture, which is pure according to the more preponderant opinion, but it nullifies ablution.