I’ve been many times in your situation. Boosting libido is a very complex thing, but there is something that you can try to temporarily boost your sexual performance: before seeing her, take supplements that can give you a steady supply of NOx: the best formula that I’ve found is arginine/citrulline malate/5p5 (vitamin b6, use only 5p5, do not use pyridoxine) . The recommended ratio for performance and endurance is 2/1/0.1, hence 2g arginine, 1g citrulline malate, 0.1g p5p. the total quantity should be around 5/6 large pill size. This combination taken once in a while is very safe.
So you may ask, why not always taking it? Unfortunately, because with PFS our neurosteroids are depleted, no matter what supplement you ingest it takes a few days to recover from masturbation or an intercourse. So if you see her only a couple of times a week it may work.
By the way, I had an adverse reaction to Taurine, I guess it depends on how screwed is your methylation cycle.