Natal Neptune is the sign where your Neptune was placed during birth time, and from there other houses are calculated clock-wise.
If you were born with Neptune in Scorpio, then your natal house is Scorpio (Vrischika Rasi) and during transit, Venus forming conjunction (in Scorpio), sextile (aspect of 60° which are Capricorn and Virgo in this case), square (aspect of 90° which are Aquarius and Leo here), trine (aspect of 120° which are Pisces and Cancer here), opposition (aspect of 180° which is Taurus here) are discussed in this article.
Conjunction is transiting through same sign as in birth chart, sextile is transiting 3rd or 11th house, trine is transiting 5th or 9th house, opposition is transiting 7th house from natal sign.
Transit Venus conjunct Natal Neptune: Telepathic links and stimulated intuitive clairvoyant and imaginative faculties characterize this transit. The native imagines a refined sense of beauty. A good time for photographers, musicians and actors for enhanced creative imaginations. The native may come across secret romantic and sexual experiences. It is a day dreaming transit and does not harm till one is practically conscious. Fear of deception in romance and financial affairs arises under afflictions to this transit.
Transit Venus Sextile Natal Neptune: Intuitive awareness of the feelings of others and increased imagination characterize this transit. The native tends to friendship and attraction of very spiritual order and exhibits most unselfish affection. A creative transit for cinematographers, musicians, photographers and artists, also they travel frequently for the same.
Transit Venus Square Natal Neptune : This transit characterize emotional hypersensitivity, misplaced sympathies and baseless romantic fantasies. The native may be the victim of deceptive love affairs and fantasies of these affairs. One may be associated temporarily to someone who arouses his emotions greatly and leads to peculiar and mysterious experiences. The native does not relate to others easily for subconscious past memories. One is prone to deception and dishonesty in financial dealings.
Transit Venus Trine Natal Neptune: Intuitive awareness and artistic imaginations of beauty and art forms characterize this transit. This transit tends to attractions of spiritual order. A transit for a creative activity on mental plane. The native is unselfish and spiritual and psychically understands the needs of others. If the transit is under afflictions then the native may be used by others due to his pliable nature. There is greater harmony in marital and romantic relationships. Meditation and other spiritual practices bring people near to their ideal due to psychic inspirations. The native may travel for pleasures. A good transit for persons in the fields of photography, music, choreography or other art forms.
Transit Venus Opposition Natal Neptune : Misdirected sentimentality, misplaced sympathy and romantic fantasies characterize this transit. Thoughts of unrealistic ideals lead to disappointment. Day dreaming is also a problem and thinking on practical lines is required. Get rich quick schemes leads to financial deception for lack of common sense. Misdirected sentimentality is also likely to interfere with sound business judgment. Laziness and financial extravagance also interfere with worth while success. The native is attracted to mystical practices and cults. The native may be an addict to drugs, alcohol and mysticism to escape from practical responsibilities.