8th house energies:

Occult, mysticism, hidden, private parts, sexual life, fear, insecurities, uncertainty, end of relationship, transformation, sudden ups & downs, Insurance, testament, hidden art, way forward to get moksha, secrecy, privacy, knowledge of occult science such as astrology, psychology, archaeology, surgery etc.

Rahu: Short cut, dishonesty, manipulation,subconscious obsessions, driving force, illusion, shadow, materialist, etc

so when you subconscious obsession meets the need to learn occult, mystic, hidden science, you will yearn to learn and achieve mysticism. You may use all your short cuts, manipulation to achieve the position in the cult of mysticism such as psychology, astrology, surgery etc.

Person may have insatiable urge for sexual intercourse, and he would like to establish this hidden, private sexual connection with everyone whom he knows. Rahu here interferes native to establish or maintain the relationship so person may have insecurities and uncertainty in relationship. Moreover, placement of your subconscious energy in the dark house will lead you to create immense interest in paranormal, parapsychological activities. You may achieve milestones in mysticism, psychology or occult paranormal activities. You may have an immense interest in enjoying the horror reading, stories, movies etc.

Aries is self centric sign, which is self obsessed and selfish so here Rahu will make native more competitive, furious, aggressive in achieving this occult goals. Person may be knowledgeable in tantra mantra, psychic energies etc.

May lord shiva bless you.