A major difference between you is that Pisces lacks Leo's natural egocentricity, personal pride and ambition, and the need to feel important and special. Pisces will not compete with Leo and is perfectly comfortable not being the one in the limelight. In fact, Pisces has a passive streak and tends to recede into the background, avoiding intensely competitive situations where decisiveness and aggressiveness are required. Personal recognition is not that important to Pisces. Leo, on the other hand, loves to be noticed and appreciated, to be the centre of attention, and tends to have an inflated sense of self-importance.
Pisces is gentle, receptive, compassionate, and very sensitive to the emotional tone in any relationship. Pisces is attuned to the subtle signals, unspoken feelings and needs of a partner, while Leo is a big vague when it comes to such things. If you want or need something from Leo, you must clearly say so.
Pisces's changeability, fluidity, elusiveness, sensitivity and awareness of subtlety fascinates or frustrates Leo, who is a much more straightforward, uncomplicated creature.
Also, Leo can easily dominate or trample over Pisces's feelings, and this can be the source of considerable unhappiness.
Leo's basic emotional tone is vibrant, sunny and warm, while Pisces's is dreamy and moody. Leo has an underlying narcissistic streak and cannot bear to be ignored, unappreciated, or considered mediocre. Often Leo will exaggerate feelings, becoming loud, boisterous, and melodramatic in order to get attention. There is a strong domineering or controlling aspect to Leo's character as well, which makes Leo something of a household tyrant at times. Pisces, on the other hand, is very receptive and gentle, not aggressive, not a fighter. Because Pisces is also sympathetic and so readily identifies with other people's feelings, Pisces is inclined to give up personal desires and rights in order to make the other person happy. Thus a pattern may develop between you where Leo is running the show and Pisces constantly obliges or acquiesces to Leo's wishes. Compared to Leo, Pisces may be something of a door mat (especially if other astrological factors do not indicate a strong will or strong sense of self).
Also, Pisces is rather chameleon-like, emotionally speaking, and is strongly influenced by the emotional atmosphere and inner feelings of others in the environment, so when Leo is up, the warmth and optimism raises Pisces's mood considerably. But if Leo is feeling negative, this is very debilitating to Pisces.
There is an obsessive quality to the desire you feel for one another and the emotional intensity of this relationship may be more than either of you wants to handle. You are deeply attracted to each other, drawn to each other like magnets, and you "get under each other's skin". You find yourselves pouring out your deepest feelings to each other. Or you may struggle to hide your true feelings from each other, and consequently become enmeshed in a very complex emotional tangle. You may feel simultaneously intensely attracted and repulsed by each other. Bonding is intense, though, and you may evoke feelings of jealousy and possessiveness in each other as well. If either of you is unwilling to have your deepest feelings exposed and your ingrained habits challenged, you will find this relationship too stressful.
This relationship will always have a highly unstable, unpredictable tone, an electric quality that is exciting but not especially soothing or peaceful.
You may see one another on an irregular basis, or have numerous separations and reunions, or for some other reason be unable to establish a steady rhythm and togetherness.
Freedom, openness, and a spirit of adventure (particularly regarding sexuality and intimate relationships) will be a must in this relationship.
There is a magnetic, rather intense attraction between you, and it is very likely that you will go through many intense challenges and emotionally powerful experiences together.
Pisces expects love and devotion. Sex in itself is not important to Pisces, providing the spiritual bond is there. Leo can find Pisces the ultimate "wet blanket" at times. Physical expression is important to Leo and Pisces in most cases, won't be turned on by Leo's gusty approach towards sex.
The two of you are likely to collaborate on community affairs, political activities, or intellectual endeavours. Pisces encourages Leo to participate in social groups and contribute to society in greater measure. It is likely that the two of you will collaborate on committees or in some kind of business. Whether your endeavours are successful depends largely on whether you can work together harmoniously; if you arouse anger in each other, you will end up being adversaries or competitors instead of partners in a team.